Nope, Mark Miller kindly put up a description of the switch that he had used, and later seen on Crutchfield's site; after a dig there, I could only find a household 4-way, 4 channel Audio/video switch which was manually actuated. It did not recognise the part number when I tried a search; I have had a guy here who deals Sony Car Audio components scratching his head trying to locate anything like it in the European parts catalogue. I am convinced it is a mythical beast, so I went ahead and bought a 4-way relay with gold contacts for about 3 pounds. With a couple of diodes, I will be building this in to perform path switching for me.